Petrograph refers to the study of rocks, their properties and composition. There are many synonyms for petrograph, including petrology, lithology, and geology. Each of these terms describes the science of rocks and how they are formed, as well as the various types of rocks and minerals that make up the Earth's crust. Other synonyms for petrograph include mineralogy, stratigraphy, and sedimentology. These terms are often used interchangeably with petrograph when discussing the geological sciences. Whether discussing the formation of granite, the composition of sandstone, or the properties of limestone, the study of rocks is a fascinating area of scientific inquiry.